Finding the Fourth Proportional to 9,759.29, 14,658.72 and 8,615.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,759.29 : 14,658.72 = 8,615.21 : x
2. Step 2: Convert to fraction form
   9,759.29/14,658.72 = 8,615.21/x
3. Step 3: Cross multiply
   9,759.29x = 14,658.72 × 8,615.21
4. Step 4: Simplify right side
   9,759.29x = 126,287,976.45
5. Step 5: Solve for x
   x = 126,287,976.45/9,759.29
6. Step 6: Final answer
   x = 12,940.29